Path: utzoo!utgpu!water!watmath!clyde!att!pacbell!ames!mailrus!iuvax!pur-ee!a.cs.uiuc.edu!uxc.cso.uiuc.edu!clio!berger
From: berger@clio.las.uiuc.edu
Newsgroups: comp.dcom.modems
Subject: Re: Help with serial to parallel conver
Message-ID: <18600056@clio>
Date: 21 Jul 88 17:36:00 GMT
References: <1099@pbhyc.PacBell.COM>
Lines: 20
Nf-ID: #R:pbhyc.PacBell.COM:1099:clio:18600056:000:866
Nf-From: clio.las.uiuc.edu!berger    Jul 21 12:36:00 1988


You should be able to do what you want with a simple UART.  Basically
you need to convert your rs232 output from the computer to TTL with
an RS232 receiver chip (National LM1489, TI 75189), use that as the
input to a UART (TR1602, COM2502, etc.), and use the 8-bit output
from the UART to drive your LED matrix decoder.  The UART will also
require a baud rate generator or fixed-rate clock at 16x the speed of
your serial data.  You might reduce chip count by using a UART with
baud rate generator built-in (like an 8250), but you want a fairly
dumb chip that can be programmed by sense switches and doesn't
require a bus interface, so a straight UART might be the best choice.


			Mike Berger
			Department of Statistics 
			Science, Technology, and Society
			University of Illinois 

			berger@clio.las.uiuc.edu
			{ihnp4 | convex | pur-ee}!uiucuxc!clio!berger